well, this may be too late if its disassembled....but the first thing you do is get a lot of plastic bags , put things in them , label all, because its going to be a lot longer until you put it together than you think...and you will NOT remember where everything goes.

as far I think...build engine if you intend to...at the same time you can do body work ,if engine is out and if needed.
paint the car....redo interior and last install conv. top if its a vert....if you chrome things do that while you get body work done...